diff --git a/packages/analytics/src/distribute.js b/packages/analytics/src/distribute.js
index cc87bac8..52ac0eff 100644
--- a/packages/analytics/src/distribute.js
+++ b/packages/analytics/src/distribute.js
@@ -60,7 +60,7 @@ export default function distribute(data, feed) {
             j += 1;
         }
         let x = 0;
-        this.store.cast()
+        this.store.empty()
             .on('data', (item) => {
                 const key = parseInt(item.id, 10);
                 const idx = ruler.indexOf(key);
diff --git a/packages/analytics/src/reducing.js b/packages/analytics/src/reducing.js
index 75cf0deb..08223377 100644
--- a/packages/analytics/src/reducing.js
+++ b/packages/analytics/src/reducing.js
@@ -42,7 +42,7 @@ export default function reducing(data, feed) {
         this.store = new Store(this.ezs, 'reducing');
     }
     if (this.isLast()) {
-        this.store.cast()
+        this.store.empty()
             .on('data', (item) => feed.write(item))
             .on('end', () => feed.close());
     } else {
diff --git a/packages/analytics/src/store.js b/packages/analytics/src/store.js
index a985b6a2..04cc1ce4 100644
--- a/packages/analytics/src/store.js
+++ b/packages/analytics/src/store.js
@@ -28,71 +28,118 @@ const lmdbEnv = () => {
     return handle;
 };
 
+export const validKey = (input) => (Boolean(input) && typeof input === 'string' && input.search(/\w+:(\/?\/?)[^\s]+/g) >= 0);
+
 export default class Store {
     constructor(ezs, domain) {
         this.ezs = ezs;
-        this.dbi = lmdbEnv(this.ezs).openDbi({
-            name: domain,
+        this.domain = domain;
+        this.open();
+    }
+
+    open() {
+        this.handle = lmdbEnv().openDbi({
+            name: this.domain,
             create: true,
         });
     }
 
+    dbi() {
+        return this.handle;
+    }
+
     get(key) {
-        return new Promise((resolve) => {
-            const txn = lmdbEnv(this.ezs).beginTxn({ readOnly: true });
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn({ readOnly: true });
             const ekey = encodeKey(key);
-            const val = decodeValue(txn.getString(this.dbi, ekey));
-            txn.commit();
-            resolve(val);
+            try {
+                const val = decodeValue(txn.getString(this.dbi(), ekey));
+                txn.abort();
+                resolve(val);
+            } catch (e) {
+                txn.abort();
+                reject(e);
+            }
         });
     }
 
     put(key, value) {
-        return new Promise((resolve) => {
-            const txn = lmdbEnv(this.ezs).beginTxn();
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn();
             const ekey = encodeKey(key);
-            txn.putString(this.dbi, ekey, encodeValue(value));
+            try {
+                txn.putString(this.dbi(), ekey, encodeValue(value));
+            } catch (e) {
+                txn.abort();
+                reject(e);
+            }
             txn.commit();
             resolve(true);
         });
     }
 
     add(key, value) {
-        return new Promise((resolve) => {
-            const txn = lmdbEnv(this.ezs).beginTxn();
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn();
             const ekey = encodeKey(key);
-            const vvalue = decodeValue(txn.getString(this.dbi, ekey));
-            if (vvalue) {
-                txn.putString(this.dbi, ekey, encodeValue(vvalue.concat(value)));
-            } else {
-                txn.putString(this.dbi, ekey, encodeValue([value]));
+            const vvalue = decodeValue(txn.getString(this.dbi(), ekey));
+            try {
+                if (vvalue) {
+                    txn.putString(this.dbi(), ekey, encodeValue(vvalue.concat(value)));
+                } else {
+                    txn.putString(this.dbi(), ekey, encodeValue([value]));
+                }
+            } catch (e) {
+                txn.abort();
+                reject(e);
             }
             txn.commit();
             resolve(true);
         });
     }
 
+    stream() {
+        return this.cast();
+    }
+
+    empty() {
+        return this.cast().on('end', () => this.reset());
+    }
+
     cast() {
-        const flow = this.ezs.createStream(this.ezs.objectMode())
-            .on('end', () => this.close());
+        const flow = this.ezs.createStream(this.ezs.objectMode());
 
         process.nextTick(() => {
             const txn = lmdbEnv(this.ezs).beginTxn({ readOnly: true });
-            const cursor = new lmdb.Cursor(txn, this.dbi);
-            for (let found = cursor.goToFirst();
-                found !== null;
-                found = cursor.goToNext()) {
-                const id = decodeKey(found);
-                const value = decodeValue(txn.getString(this.dbi, found));
-                flow.write({ id, value });
-            }
-            flow.end();
-            txn.commit();
+            const cursor = new lmdb.Cursor(txn, this.dbi());
+            const walker = (found, done) => {
+                if (found) {
+                    const id = decodeKey(found);
+                    const value = decodeValue(txn.getString(this.dbi(), found));
+                    this.ezs.writeTo(flow, { id, value }, (err, writable) => {
+                        if (err || writable === false) {
+                            return done();
+                        }
+                        return walker(cursor.goToNext(), done);
+                    });
+                } else {
+                    done();
+                }
+            };
+            walker(cursor.goToFirst(), () => {
+                flow.end();
+                txn.abort();
+            });
         });
         return flow;
     }
 
+    reset() {
+        this.dbi().drop();
+        this.open();
+    }
+
     close() {
-        return this.dbi.drop();
+        this.dbi().close();
     }
 }
diff --git a/packages/lodex/src/formatOutput.js b/packages/lodex/src/formatOutput.js
index 01aabdf8..fb304401 100644
--- a/packages/lodex/src/formatOutput.js
+++ b/packages/lodex/src/formatOutput.js
@@ -48,8 +48,8 @@ function formatOutput(data, feed) {
             let check = false;
             keys.forEach((k, index) => {
                 if (values[index]) {
+                    feed.write(!check ? ' ' : ',');
                     check = true;
-                    feed.write(index === 0 ? ' ' : ',');
                     feed.write(json(k));
                     feed.write(':');
                     feed.write(json(values[index]));
diff --git a/packages/storage/src/boost.js b/packages/storage/src/boost.js
index 33af1580..0166791a 100644
--- a/packages/storage/src/boost.js
+++ b/packages/storage/src/boost.js
@@ -1,18 +1,24 @@
 import hasher from 'node-object-hash';
 import DateDiff from 'date-diff';
 import debug from 'debug';
-import {
-    decodeValue, encodeKey, encodeValue, lmdbEnv,
-} from './store';
-
-
-let dbi;
+import Store  from './store';
 
 const hashCoerce = hasher({
     sort: false,
     coerce: true,
 });
 
+function createURI(data, feed) {
+    if (this.isLast()) {
+        return feed.close();
+    }
+    const uri = 'uid:'.concat(this.getIndex().toString().padStart(10, '0'));
+    return feed.send({
+        value: [data],
+        uri,
+    });
+}
+
 const computeHash = (commands, environment, chunk) => {
     const commandsHash = hashCoerce.hash(commands);
     const environmentHash = hashCoerce.hash(environment);
@@ -45,7 +51,7 @@ function hitThe(cache, ttl) {
  * @param {Number} [cleanupDelay=600] Frequency (seconds) to cleanup the cache (10 min)
  * @returns {Object}
  */
-export default function boost(data, feed) {
+export default async function boost(data, feed) {
     const { ezs } = this;
     if (this.isFirst()) {
         const file = this.getParam('file');
@@ -55,22 +61,16 @@ export default function boost(data, feed) {
         const commands = this.getParam('commands', cmds.get());
         const cleanupDelay = Number(this.getParam('cleanupDelay', 10 * 60));
         const environment = this.getEnv();
-        if (!dbi) {
-            dbi = lmdbEnv(this.ezs).openDbi({
-                name: 'cache_index',
-                create: true,
-            });
+        if (!this.store) {
+            this.store = new Store(this.ezs, 'cache_index');
         }
-
         if (!commands || commands.length === 0) {
             return feed.stop(new Error('Invalid parameter for booster'));
         }
 
         const streams = ezs.compileCommands(commands, environment);
         const uniqHash = String(this.getParam('key') || computeHash(commands, environment, data));
-        const txn = lmdbEnv().beginTxn({ readOnly: true });
-        const cache = decodeValue(txn.getString(dbi, uniqHash));
-        txn.commit();
+        const cache = await this.store.get(uniqHash);
 
         if (hitThe(cache, cleanupDelay)) {
             debug('ezs')('Boost using cache with hash', uniqHash);
@@ -96,8 +96,7 @@ export default function boost(data, feed) {
             .pipe(ezs.catch())
             .on('error', (e) => feed.write(e))
             .on('data', (d) => feed.write(d))
-            .pipe(ezs((da, fe) => (da === null ? fe.close() : fe.send({ value: [da] }))))
-            .pipe(ezs('storage:identify'))
+            .pipe(ezs(createURI))
             .pipe(ezs('storage:save', { domain: uniqHash, reset: true }))
             .pipe(ezs.catch());
         this.whenFinish = new Promise((cacheSaved) => {
@@ -105,11 +104,14 @@ export default function boost(data, feed) {
                 debug('ezs')('Error catched, no cache created with hash', uniqHash, error);
                 cacheSaved();
             });
-            cacheSetOutput.on('end', () => {
+            cacheSetOutput.on('end', async () => {
                 debug('ezs')('Registering cache with hash', uniqHash);
-                const txn2 = lmdbEnv().beginTxn();
-                txn2.putString(dbi, encodeKey(uniqHash), encodeValue({ createdDate: Date.now() }));
-                txn2.commit();
+                try {
+                    await this.store.put(uniqHash, { createdDate: Date.now() });
+                } catch (error) {
+                    debug('ezs')('Error catched, no cache created with hash', uniqHash, error);
+                    cacheSaved();
+                }
                 cacheSaved();
             });
         });
@@ -128,6 +130,7 @@ export default function boost(data, feed) {
                     debug('ezs')(`${this.getIndex()} chunks have been boosted`);
                     this.whenFinish
                         .then(() => {
+                            this.store.close();
                             feed.close();
                         })
                         .catch((e) => feed.stop(e));
diff --git a/packages/storage/src/flow.js b/packages/storage/src/flow.js
index f9c911f3..d7ec21c3 100644
--- a/packages/storage/src/flow.js
+++ b/packages/storage/src/flow.js
@@ -1,5 +1,4 @@
-import lmdb from 'node-lmdb';
-import { encodeKey, decodeValue, lmdbEnv } from './store';
+import Store from './store';
 
 /**
  * Take an `Object` and replace it with all the objects of the same domain contained in the store.
@@ -11,29 +10,21 @@ import { encodeKey, decodeValue, lmdbEnv } from './store';
  */
 export default async function flow(data, feed) {
     const length = Number(this.getParam('length', -1));
+    const statement = length === -1 ? 'transit' : 'truncate';
     const domainName = this.getParam('domain', 'ezs');
     const domain = Array.isArray(domainName) ? domainName.shift() : domainName;
-    if (this.isFirst()) {
-        this.dbi = lmdbEnv(this.ezs).openDbi({
-            name: domain,
-        });
+    if (!this.store) {
+        this.store = new Store(this.ezs, domain);
     }
     if (this.isLast()) {
-        if (this.dbi) {
-            this.dbi.close();
-        }
+        this.store.close();
         return feed.close();
     }
-    const txn = lmdbEnv(this.ezs).beginTxn({ readOnly: true });
-    const cursor = new lmdb.Cursor(txn, this.dbi);
-    let counter = 0;
-    for (let found = cursor.goToFirst();
-        (found !== null && (counter < length || length < 0));
-        found = cursor.goToNext()) {
-        counter += 1;
-        const value = txn.getString(this.dbi, encodeKey(found));
-        feed.write(decodeValue(value));
-    }
-    txn.commit();
-    return feed.end();
+
+    return this.store.stream()
+        .pipe(this.ezs('extract', { path: 'value' }))
+        .pipe(this.ezs(statement, { length }))
+        .on('data', (item) => feed.write(item))
+        .on('error', (e) => feed.stop(e))
+        .on('end', () => feed.end());
 }
diff --git a/packages/storage/src/load.js b/packages/storage/src/load.js
index 1fdf88c5..1900fe47 100644
--- a/packages/storage/src/load.js
+++ b/packages/storage/src/load.js
@@ -1,6 +1,4 @@
-import {
-    validKey, encodeKey, decodeValue, lmdbEnv,
-} from './store';
+import Store, { validKey } from './store';
 
 /**
  * With a `String`, containing a URI throw all the documents that match
@@ -10,23 +8,17 @@ import {
  */
 export default async function load(data, feed) {
     const domain = this.getParam('domain', 'ezs');
-    if (this.isFirst()) {
-        this.dbi = lmdbEnv(this.ezs).openDbi({
-            name: domain,
-            create: true,
-        });
+    if (!this.store) {
+        this.store = new Store(this.ezs, domain);
     }
     if (this.isLast()) {
-        if (this.dbi) {
-            this.dbi.close();
-        }
+        this.store.close();
         return feed.close();
     }
     if (!validKey(data)) {
         return feed.end();
     }
-    const txn = lmdbEnv(this.ezs).beginTxn({ readOnly: true });
-    const value = feed.send(decodeValue(txn.getString(this.dbi, encodeKey(data))));
-    txn.commit();
+
+    const value = await this.store.get(data);
     return feed.send(value);
 }
diff --git a/packages/storage/src/save.js b/packages/storage/src/save.js
index 6c2ddc1a..99efe806 100644
--- a/packages/storage/src/save.js
+++ b/packages/storage/src/save.js
@@ -1,8 +1,6 @@
 import { hostname } from 'os';
 import get from 'lodash.get';
-import {
-    validKey, encodeKey, encodeValue, lmdbEnv,
-} from './store';
+import Store, { validKey } from './store';
 
 /**
  * Take `Object`, to save it into a store and throw an URL
@@ -22,32 +20,20 @@ export default async function save(data, feed) {
     const uri = get(data, path);
     const domainName = this.getParam('domain', 'ezs');
     const domain = Array.isArray(domainName) ? domainName.shift() : domainName;
-
-    if (this.isFirst()) {
-        this.dbi = lmdbEnv(this.ezs).openDbi({
-            name: domain,
-            create: true,
-        });
+    if (!this.store) {
+        this.store = new Store(this.ezs, domain);
+    }
+    if (this.isFirst() && reset === true) {
+        this.store.reset();
     }
     if (this.isLast()) {
-        if (this.dbi) {
-            this.dbi.close();
-        }
+        this.store.close();
         return feed.close();
     }
     if (!validKey(uri)) {
         return feed.end();
     }
-    if (this.isFirst() && reset === true) {
-        this.dbi.drop();
-        this.dbi = lmdbEnv(this.ezs).openDbi({
-            name: domain,
-            create: true,
-        });
-    }
-    const txn = lmdbEnv(this.ezs).beginTxn();
-    txn.putString(this.dbi, encodeKey(uri), encodeValue(data));
-    txn.commit();
+    await this.store.put(uri, data);
 
     if (protocol && host) {
         return feed.send(`${protocol}//${host}/${uri}`);
diff --git a/packages/storage/src/store.js b/packages/storage/src/store.js
index 5cdb53d3..04cc1ce4 100644
--- a/packages/storage/src/store.js
+++ b/packages/storage/src/store.js
@@ -1,22 +1,21 @@
-import { join } from 'path';
-import { tmpdir, totalmem, cpus } from 'os';
+import { totalmem, cpus } from 'os';
 import pathExists from 'path-exists';
+import tmpFilepath from 'tmp-filepath';
 import makeDir from 'make-dir';
 import lmdb from 'node-lmdb';
 
-const EZS_STORAGE_PATH = process.env.EZS_STORAGE_PATH || tmpdir();
 const maxDbs = cpus().length ** 2;
 const mapSize = totalmem() / 2;
+const encodeKey = (k) => JSON.stringify(k);
+const decodeKey = (k) => JSON.parse(String(k));
+const encodeValue = (v) => JSON.stringify(v);
+const decodeValue = (v) => JSON.parse(String(v));
 let handle;
-export const validKey = (input) => (Boolean(input) && typeof input === 'string' && input.search(/\w+:(\/?\/?)[^\s]+/g) >= 0);
-export const encodeKey = (k) => k;
-export const encodeValue = (v) => JSON.stringify(v);
-export const decodeValue = (v) => JSON.parse(String(v));
-export const lmdbEnv = () => {
+const lmdbEnv = () => {
     if (handle) {
         return handle;
     }
-    const path = join(EZS_STORAGE_PATH, 'store');
+    const path = tmpFilepath('store');
     if (!pathExists.sync(path)) {
         makeDir.sync(path);
     }
@@ -29,3 +28,118 @@ export const lmdbEnv = () => {
     return handle;
 };
 
+export const validKey = (input) => (Boolean(input) && typeof input === 'string' && input.search(/\w+:(\/?\/?)[^\s]+/g) >= 0);
+
+export default class Store {
+    constructor(ezs, domain) {
+        this.ezs = ezs;
+        this.domain = domain;
+        this.open();
+    }
+
+    open() {
+        this.handle = lmdbEnv().openDbi({
+            name: this.domain,
+            create: true,
+        });
+    }
+
+    dbi() {
+        return this.handle;
+    }
+
+    get(key) {
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn({ readOnly: true });
+            const ekey = encodeKey(key);
+            try {
+                const val = decodeValue(txn.getString(this.dbi(), ekey));
+                txn.abort();
+                resolve(val);
+            } catch (e) {
+                txn.abort();
+                reject(e);
+            }
+        });
+    }
+
+    put(key, value) {
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn();
+            const ekey = encodeKey(key);
+            try {
+                txn.putString(this.dbi(), ekey, encodeValue(value));
+            } catch (e) {
+                txn.abort();
+                reject(e);
+            }
+            txn.commit();
+            resolve(true);
+        });
+    }
+
+    add(key, value) {
+        return new Promise((resolve, reject) => {
+            const txn = lmdbEnv().beginTxn();
+            const ekey = encodeKey(key);
+            const vvalue = decodeValue(txn.getString(this.dbi(), ekey));
+            try {
+                if (vvalue) {
+                    txn.putString(this.dbi(), ekey, encodeValue(vvalue.concat(value)));
+                } else {
+                    txn.putString(this.dbi(), ekey, encodeValue([value]));
+                }
+            } catch (e) {
+                txn.abort();
+                reject(e);
+            }
+            txn.commit();
+            resolve(true);
+        });
+    }
+
+    stream() {
+        return this.cast();
+    }
+
+    empty() {
+        return this.cast().on('end', () => this.reset());
+    }
+
+    cast() {
+        const flow = this.ezs.createStream(this.ezs.objectMode());
+
+        process.nextTick(() => {
+            const txn = lmdbEnv(this.ezs).beginTxn({ readOnly: true });
+            const cursor = new lmdb.Cursor(txn, this.dbi());
+            const walker = (found, done) => {
+                if (found) {
+                    const id = decodeKey(found);
+                    const value = decodeValue(txn.getString(this.dbi(), found));
+                    this.ezs.writeTo(flow, { id, value }, (err, writable) => {
+                        if (err || writable === false) {
+                            return done();
+                        }
+                        return walker(cursor.goToNext(), done);
+                    });
+                } else {
+                    done();
+                }
+            };
+            walker(cursor.goToFirst(), () => {
+                flow.end();
+                txn.abort();
+            });
+        });
+        return flow;
+    }
+
+    reset() {
+        this.dbi().drop();
+        this.open();
+    }
+
+    close() {
+        this.dbi().close();
+    }
+}
diff --git a/packages/storage/test/boost.js b/packages/storage/test/boost.js
index 9c525e68..1210e88c 100644
--- a/packages/storage/test/boost.js
+++ b/packages/storage/test/boost.js
@@ -512,7 +512,7 @@ describe('boost', () => {
     });
 
 
-    describe('with a pipeline & a fixed key in parallel', () => {
+    describe.only('with a pipeline & a fixed key in parallel', () => {
         const script = `
         [transit]
 
@@ -558,7 +558,7 @@ describe('boost', () => {
                         .on('cache:created', (id) => {
                             cid = id;
                         })
-                        .on('error', (e) => expect(e).toBetoBeUndefined())
+                        .on('error', (e) => expect(e).toBeUndefined())
                         .on('data', (chunk) => {
                             res += chunk;
                         })